You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allpages apcontinue="Notification_of_Death_to_Others" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="219" ns="0" title="Death Drill" />
      <p pageid="88" ns="0" title="FAQ" />
      <p pageid="204" ns="0" title="Historical examples of how corpses are handled" />
      <p pageid="4" ns="0" title="Inquiry to Programs" />
      <p pageid="2" ns="0" title="Instructions to People" />
      <p pageid="5" ns="0" title="List of Cadaver Programs" />
      <p pageid="3" ns="0" title="Mailing List Auto Response" />
      <p pageid="6" ns="0" title="Mailing List Invite" />
      <p pageid="1" ns="0" title="Main Page" />
      <p pageid="9" ns="0" title="Notaries" />
    </allpages>
  </query>
</api>